{
  "manageEntity": {
    "action": "Update",
    "entityId": "600984032",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaieraqzlrs3r5e5zevtgk47xav35ndpa4faigxwfnsjtnafzo4j7mtk5q\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281},{\"type\":\"playlist\",\"playlist_id\":950624837}]}}}",
    "nonce": "0x26cffa57f58fa94cb68f634869eb987efa52d7f00694210ecc2dac0c0b37ed90",
    "signature": "0xcaef4e096ab5d8c2f145bd85cd93635c2a81ea839cf317c695a1d46bc8d9364845e7e39861142324c34be554f24a081f235994c7b60ecf841c5c8d52ba0334ab1b",
    "signer": "0x4209027Fe78Cf6820a14aE8e5F03B6E282fff14A",
    "userId": "600984032"
  }
}